My paid app has been published on the WP7 marketplace. Now I would like to create a free version of the app.
I figure I would have a constant IsFreeVersion = true; and then based on that disable some functionality.
What would be the best approach to setting up my project for this? I definitely do not want to have two versions of the code. So should I create a new project and link the files?
Also, how do I handle the different application icons? Finally, wouldn't I need a separate GUID for my application Id?
If you want separate apps for the free and paid versions (Presumably you're limiting the functionality of the free app or adding ads) then I'd create a separate project and then link to the exisiting files of the other (use "add as link").
You can then customize the different versions as necessary. When doing things like this I like to use partial methods (and classes) to extend and customize the different versions.
You may also want to use app specific compiler directives to limit functionality to a specific version.